Commit | Line | Data |
---|---|---|
096102bd | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 David Goulet <dgoulet@efficios.com> |
3 | * Copyright (C) 2014 Jan Glauber <jan.glauber@gmail.com> | |
096102bd | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
096102bd | 6 | * |
096102bd DG |
7 | */ |
8 | ||
d11b2027 MJ |
9 | /** |
10 | * @file modprobe.c | |
11 | * | |
12 | * @brief modprobe related functions. | |
13 | * | |
14 | */ | |
15 | ||
6c1c0768 | 16 | #define _LGPL_SOURCE |
096102bd DG |
17 | #include <stdio.h> |
18 | #include <stdlib.h> | |
19 | #include <sys/wait.h> | |
20 | ||
21 | #include <common/common.h> | |
fbb9748b | 22 | #include <common/utils.h> |
096102bd DG |
23 | |
24 | #include "modprobe.h" | |
25 | #include "kern-modules.h" | |
e6142f2e | 26 | #include "lttng-sessiond.h" |
096102bd | 27 | |
ab57d7d3 JG |
28 | /* LTTng kernel tracer mandatory core modules list */ |
29 | struct kern_modules_param kern_modules_control_core[] = { | |
adfe4f5e JG |
30 | { |
31 | .name = (char *) "lttng-ring-buffer-client-discard", | |
32 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
33 | }, | |
34 | { | |
35 | .name = (char *) "lttng-ring-buffer-client-overwrite", | |
36 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
37 | }, | |
38 | { | |
39 | .name = (char *) "lttng-ring-buffer-metadata-client", | |
40 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
41 | }, | |
42 | { | |
43 | .name = (char *) "lttng-ring-buffer-client-mmap-discard", | |
44 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
45 | }, | |
46 | { | |
47 | .name = (char *) "lttng-ring-buffer-client-mmap-overwrite", | |
48 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
49 | }, | |
50 | { | |
51 | .name = (char *) "lttng-ring-buffer-metadata-mmap-client", | |
52 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
53 | }, | |
87a15032 JR |
54 | { |
55 | .name = (char *) "lttng-ring-buffer-event_notifier-client", | |
56 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
57 | }, | |
90aa04a1 FD |
58 | { |
59 | .name = (char *) "lttng-counter-client-percpu-64-modular", | |
60 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
61 | }, | |
62 | { | |
63 | .name = (char *) "lttng-counter-client-percpu-32-modular", | |
64 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
65 | }, | |
ab57d7d3 JG |
66 | }; |
67 | ||
adfe4f5e | 68 | /* LTTng kerneltracer probe modules list */ |
fbb9748b | 69 | struct kern_modules_param kern_modules_probes_default[] = { |
adfe4f5e JG |
70 | { |
71 | .name = (char *) "lttng-probe-asoc", | |
72 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
73 | }, | |
74 | { | |
75 | .name = (char *) "lttng-probe-block", | |
76 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
77 | }, | |
78 | { | |
79 | .name = (char *) "lttng-probe-btrfs", | |
80 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
81 | }, | |
82 | { | |
83 | .name = (char *) "lttng-probe-compaction", | |
84 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
85 | }, | |
86 | { | |
87 | .name = (char *) "lttng-probe-ext3", | |
88 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
89 | }, | |
90 | { | |
91 | .name = (char *) "lttng-probe-ext4", | |
92 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
93 | }, | |
94 | { | |
95 | .name = (char *) "lttng-probe-gpio", | |
96 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
97 | }, | |
98 | { | |
99 | .name = (char *) "lttng-probe-i2c", | |
100 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
101 | }, | |
102 | { | |
103 | .name = (char *) "lttng-probe-irq", | |
104 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
105 | }, | |
106 | { | |
107 | .name = (char *) "lttng-probe-jbd", | |
108 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
109 | }, | |
110 | { | |
111 | .name = (char *) "lttng-probe-jbd2", | |
112 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
113 | }, | |
114 | { | |
115 | .name = (char *) "lttng-probe-kmem", | |
116 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
117 | }, | |
118 | { | |
119 | .name = (char *) "lttng-probe-kvm", | |
120 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
121 | }, | |
122 | { | |
123 | .name = (char *) "lttng-probe-kvm-x86", | |
124 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
125 | }, | |
126 | { | |
127 | .name = (char *) "lttng-probe-kvm-x86-mmu", | |
128 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
129 | }, | |
130 | { | |
131 | .name = (char *) "lttng-probe-lock", | |
132 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
133 | }, | |
134 | { | |
135 | .name = (char *) "lttng-probe-module", | |
136 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
137 | }, | |
138 | { | |
139 | .name = (char *) "lttng-probe-napi", | |
140 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
141 | }, | |
142 | { | |
143 | .name = (char *) "lttng-probe-net", | |
144 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
145 | }, | |
146 | { | |
147 | .name = (char *) "lttng-probe-power", | |
148 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
149 | }, | |
150 | { | |
151 | .name = (char *) "lttng-probe-preemptirq", | |
152 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
153 | }, | |
154 | { | |
155 | .name = (char *) "lttng-probe-printk", | |
156 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
157 | }, | |
158 | { | |
159 | .name = (char *) "lttng-probe-random", | |
160 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
161 | }, | |
162 | { | |
163 | .name = (char *) "lttng-probe-rcu", | |
164 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
165 | }, | |
166 | { | |
167 | .name = (char *) "lttng-probe-regmap", | |
168 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
169 | }, | |
170 | { | |
171 | .name = (char *) "lttng-probe-regulator", | |
172 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
173 | }, | |
174 | { | |
175 | .name = (char *) "lttng-probe-rpm", | |
176 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
177 | }, | |
178 | { | |
179 | .name = (char *) "lttng-probe-sched", | |
180 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
181 | }, | |
182 | { | |
183 | .name = (char *) "lttng-probe-scsi", | |
184 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
185 | }, | |
186 | { | |
187 | .name = (char *) "lttng-probe-signal", | |
188 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
189 | }, | |
190 | { | |
191 | .name = (char *) "lttng-probe-skb", | |
192 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
193 | }, | |
194 | { | |
195 | .name = (char *) "lttng-probe-sock", | |
196 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
197 | }, | |
198 | { | |
199 | .name = (char *) "lttng-probe-statedump", | |
200 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
201 | }, | |
202 | { | |
203 | .name = (char *) "lttng-probe-sunrpc", | |
204 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
205 | }, | |
206 | { | |
207 | .name = (char *) "lttng-probe-timer", | |
208 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
209 | }, | |
210 | { | |
211 | .name = (char *) "lttng-probe-udp", | |
212 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
213 | }, | |
214 | { | |
215 | .name = (char *) "lttng-probe-vmscan", | |
216 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
217 | }, | |
218 | { | |
219 | .name = (char *) "lttng-probe-v4l2", | |
220 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
221 | }, | |
222 | { | |
223 | .name = (char *) "lttng-probe-workqueue", | |
224 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
225 | }, | |
226 | { | |
227 | .name = (char *) "lttng-probe-writeback", | |
228 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
229 | }, | |
230 | { | |
231 | .name = (char *) "lttng-probe-x86-irq-vectors", | |
232 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
233 | }, | |
234 | { | |
235 | .name = (char *) "lttng-probe-x86-exceptions", | |
236 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
237 | }, | |
096102bd DG |
238 | }; |
239 | ||
fbb9748b JG |
240 | /* dynamic probe modules list */ |
241 | static struct kern_modules_param *probes; | |
242 | static int nr_probes; | |
c9d42407 | 243 | static int probes_capacity; |
fbb9748b | 244 | |
234170ac UTL |
245 | #if HAVE_KMOD |
246 | #include <libkmod.h> | |
866c17ce | 247 | |
d11b2027 MJ |
248 | /** |
249 | * @brief Logging function for libkmod integration. | |
250 | */ | |
234170ac UTL |
251 | static void log_kmod(void *data, int priority, const char *file, int line, |
252 | const char *fn, const char *format, va_list args) | |
253 | { | |
254 | char *str; | |
255 | ||
256 | if (vasprintf(&str, format, args) < 0) { | |
257 | return; | |
258 | } | |
259 | ||
260 | DBG("libkmod: %s", str); | |
261 | free(str); | |
262 | } | |
866c17ce | 263 | |
d11b2027 MJ |
264 | /** |
265 | * @brief Setup the libkmod context. | |
266 | * | |
267 | * Create the context, add a custom logging function and preload the | |
268 | * ressources for faster operation. | |
269 | * | |
270 | * @returns \c 0 on success | |
271 | * \c < 0 on error | |
272 | */ | |
866c17ce | 273 | static int setup_kmod_ctx(struct kmod_ctx **ctx) |
234170ac | 274 | { |
866c17ce | 275 | int ret = 0; |
234170ac | 276 | |
866c17ce | 277 | *ctx = kmod_new(NULL, NULL); |
234170ac UTL |
278 | if (!ctx) { |
279 | PERROR("Unable to create kmod library context"); | |
280 | ret = -ENOMEM; | |
281 | goto error; | |
282 | } | |
283 | ||
866c17ce MJ |
284 | kmod_set_log_fn(*ctx, log_kmod, NULL); |
285 | ret = kmod_load_resources(*ctx); | |
286 | if (ret < 0) { | |
287 | ERR("Failed to load kmod library resources"); | |
288 | goto error; | |
289 | } | |
290 | ||
291 | error: | |
292 | return ret; | |
293 | } | |
294 | ||
d11b2027 MJ |
295 | /** |
296 | * @brief Loads the kernel modules in \p modules | |
297 | * | |
298 | * @param modules List of modules to load | |
299 | * @param entries Number of modules in the list | |
d11b2027 MJ |
300 | * |
301 | * If the modules are required, we will return with error after the | |
302 | * first failed module load, otherwise we continue loading. | |
303 | * | |
304 | * @returns \c 0 on success | |
305 | * \c < 0 on error | |
306 | */ | |
866c17ce | 307 | static int modprobe_lttng(struct kern_modules_param *modules, |
adfe4f5e | 308 | int entries) |
866c17ce MJ |
309 | { |
310 | int ret = 0, i; | |
311 | struct kmod_ctx *ctx; | |
312 | ||
313 | ret = setup_kmod_ctx(&ctx); | |
314 | if (ret < 0) { | |
315 | goto error; | |
316 | } | |
234170ac UTL |
317 | |
318 | for (i = 0; i < entries; i++) { | |
319 | struct kmod_module *mod = NULL; | |
320 | ||
321 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); | |
322 | if (ret < 0) { | |
323 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
324 | goto error; | |
325 | } | |
326 | ||
0b1e16b8 | 327 | ret = kmod_module_probe_insert_module(mod, 0, |
234170ac | 328 | NULL, NULL, NULL, NULL); |
0b1e16b8 MJ |
329 | if (ret == -EEXIST) { |
330 | DBG("Module %s is already loaded", modules[i].name); | |
331 | ret = 0; | |
332 | } else if (ret < 0) { | |
adfe4f5e | 333 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
16c2e854 PP |
334 | ERR("Unable to load required module %s", |
335 | modules[i].name); | |
336 | goto error; | |
337 | } else { | |
338 | DBG("Unable to load optional module %s; continuing", | |
339 | modules[i].name); | |
340 | ret = 0; | |
341 | } | |
234170ac UTL |
342 | } else { |
343 | DBG("Modprobe successfully %s", modules[i].name); | |
4ad664a0 | 344 | modules[i].loaded = true; |
234170ac UTL |
345 | } |
346 | ||
347 | kmod_module_unref(mod); | |
348 | } | |
349 | ||
350 | error: | |
351 | if (ctx) { | |
352 | kmod_unref(ctx); | |
353 | } | |
354 | return ret; | |
355 | } | |
356 | ||
d11b2027 MJ |
357 | /** |
358 | * @brief Recursively unload modules. | |
359 | * | |
360 | * This function implements the same modules unloading behavior as | |
361 | * 'modprobe -r' or rmmod, it will recursevily go trought the \p module | |
362 | * dependencies and unload modules with a refcount of 0. | |
363 | * | |
364 | * @param mod The module to unload | |
365 | * | |
366 | * @returns \c 0 on success | |
367 | * \c < 0 on error | |
368 | */ | |
866c17ce MJ |
369 | static int rmmod_recurse(struct kmod_module *mod) { |
370 | int ret = 0; | |
371 | struct kmod_list *deps, *itr; | |
372 | ||
373 | if (kmod_module_get_initstate(mod) == KMOD_MODULE_BUILTIN) { | |
374 | DBG("Module %s is builtin", kmod_module_get_name(mod)); | |
375 | return ret; | |
376 | } | |
377 | ||
378 | ret = kmod_module_remove_module(mod, 0); | |
379 | ||
380 | deps = kmod_module_get_dependencies(mod); | |
381 | if (deps != NULL) { | |
382 | kmod_list_foreach(itr, deps) { | |
383 | struct kmod_module *dep = kmod_module_get_module(itr); | |
384 | if (kmod_module_get_refcnt(dep) == 0) { | |
385 | DBG("Recursive remove module %s", | |
386 | kmod_module_get_name(dep)); | |
387 | rmmod_recurse(dep); | |
388 | } | |
389 | kmod_module_unref(dep); | |
390 | } | |
391 | kmod_module_unref_list(deps); | |
392 | } | |
393 | ||
394 | return ret; | |
395 | } | |
396 | ||
d11b2027 MJ |
397 | /** |
398 | * @brief Unloads the kernel modules in \p modules | |
399 | * | |
400 | * @param modules List of modules to unload | |
401 | * @param entries Number of modules in the list | |
d11b2027 MJ |
402 | * |
403 | */ | |
866c17ce | 404 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
adfe4f5e | 405 | int entries) |
866c17ce MJ |
406 | { |
407 | int ret = 0, i; | |
408 | struct kmod_ctx *ctx; | |
409 | ||
410 | ret = setup_kmod_ctx(&ctx); | |
411 | if (ret < 0) { | |
412 | goto error; | |
413 | } | |
414 | ||
415 | for (i = entries - 1; i >= 0; i--) { | |
416 | struct kmod_module *mod = NULL; | |
417 | ||
4ad664a0 JG |
418 | if (!modules[i].loaded) { |
419 | continue; | |
420 | } | |
421 | ||
866c17ce MJ |
422 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); |
423 | if (ret < 0) { | |
424 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
425 | goto error; | |
426 | } | |
427 | ||
428 | ret = rmmod_recurse(mod); | |
429 | if (ret == -EEXIST) { | |
430 | DBG("Module %s is not in kernel.", modules[i].name); | |
adfe4f5e | 431 | } else if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED && ret < 0) { |
866c17ce MJ |
432 | ERR("Unable to remove module %s", modules[i].name); |
433 | } else { | |
434 | DBG("Modprobe removal successful %s", | |
435 | modules[i].name); | |
436 | } | |
437 | ||
438 | kmod_module_unref(mod); | |
439 | } | |
440 | ||
441 | error: | |
442 | if (ctx) { | |
443 | kmod_unref(ctx); | |
444 | } | |
445 | } | |
446 | ||
234170ac UTL |
447 | #else /* HAVE_KMOD */ |
448 | ||
fbb9748b | 449 | static int modprobe_lttng(struct kern_modules_param *modules, |
adfe4f5e | 450 | int entries) |
096102bd DG |
451 | { |
452 | int ret = 0, i; | |
453 | char modprobe[256]; | |
454 | ||
e23b81ed | 455 | for (i = 0; i < entries; i++) { |
096102bd DG |
456 | ret = snprintf(modprobe, sizeof(modprobe), |
457 | "/sbin/modprobe %s%s", | |
adfe4f5e | 458 | modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED ? "" : "-q ", |
e23b81ed | 459 | modules[i].name); |
096102bd DG |
460 | if (ret < 0) { |
461 | PERROR("snprintf modprobe"); | |
462 | goto error; | |
463 | } | |
464 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
465 | ret = system(modprobe); | |
466 | if (ret == -1) { | |
adfe4f5e | 467 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
16c2e854 PP |
468 | ERR("Unable to launch modprobe for required module %s", |
469 | modules[i].name); | |
470 | goto error; | |
471 | } else { | |
472 | DBG("Unable to launch modprobe for optional module %s; continuing", | |
473 | modules[i].name); | |
474 | ret = 0; | |
475 | } | |
476 | } else if (WEXITSTATUS(ret) != 0) { | |
adfe4f5e | 477 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
16c2e854 PP |
478 | ERR("Unable to load required module %s", |
479 | modules[i].name); | |
480 | goto error; | |
481 | } else { | |
482 | DBG("Unable to load optional module %s; continuing", | |
483 | modules[i].name); | |
484 | ret = 0; | |
485 | } | |
096102bd | 486 | } else { |
ab57d7d3 | 487 | DBG("Modprobe successfully %s", modules[i].name); |
355d2778 | 488 | modules[i].loaded = true; |
096102bd DG |
489 | } |
490 | } | |
491 | ||
492 | error: | |
493 | return ret; | |
494 | } | |
495 | ||
35e090b7 | 496 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
adfe4f5e | 497 | int entries) |
35e090b7 MJ |
498 | { |
499 | int ret = 0, i; | |
500 | char modprobe[256]; | |
501 | ||
502 | for (i = entries - 1; i >= 0; i--) { | |
4ad664a0 JG |
503 | if (!modules[i].loaded) { |
504 | continue; | |
505 | } | |
35e090b7 MJ |
506 | ret = snprintf(modprobe, sizeof(modprobe), |
507 | "/sbin/modprobe -r -q %s", | |
508 | modules[i].name); | |
509 | if (ret < 0) { | |
510 | PERROR("snprintf modprobe -r"); | |
511 | return; | |
512 | } | |
513 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
514 | ret = system(modprobe); | |
515 | if (ret == -1) { | |
1d25334c FD |
516 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
517 | ERR("Unable to launch modprobe -r for required module %s", | |
518 | modules[i].name); | |
519 | } else { | |
520 | DBG("Unable to launch modprobe -r for optional module %s", | |
521 | modules[i].name); | |
522 | } | |
523 | } else if (WEXITSTATUS(ret) != 0) { | |
524 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { | |
525 | ERR("Unable to remove required module %s", | |
526 | modules[i].name); | |
527 | } else { | |
528 | DBG("Unable to remove optional module %s", | |
529 | modules[i].name); | |
530 | } | |
35e090b7 | 531 | } else { |
1d25334c | 532 | DBG("Modprobe removal successful %s", modules[i].name); |
35e090b7 MJ |
533 | } |
534 | } | |
535 | } | |
536 | ||
866c17ce MJ |
537 | #endif /* HAVE_KMOD */ |
538 | ||
35e090b7 MJ |
539 | /* |
540 | * Remove control kernel module(s) in reverse load order. | |
541 | */ | |
542 | void modprobe_remove_lttng_control(void) | |
543 | { | |
544 | modprobe_remove_lttng(kern_modules_control_core, | |
adfe4f5e | 545 | ARRAY_SIZE(kern_modules_control_core)); |
35e090b7 MJ |
546 | } |
547 | ||
548 | static void free_probes(void) | |
549 | { | |
550 | int i; | |
551 | ||
552 | if (!probes) { | |
553 | return; | |
554 | } | |
555 | for (i = 0; i < nr_probes; ++i) { | |
556 | free(probes[i].name); | |
557 | } | |
558 | free(probes); | |
559 | probes = NULL; | |
560 | nr_probes = 0; | |
561 | } | |
562 | ||
563 | /* | |
564 | * Remove data kernel modules in reverse load order. | |
565 | */ | |
566 | void modprobe_remove_lttng_data(void) | |
567 | { | |
568 | if (!probes) { | |
569 | return; | |
570 | } | |
adfe4f5e JG |
571 | |
572 | modprobe_remove_lttng(probes, nr_probes); | |
35e090b7 MJ |
573 | free_probes(); |
574 | } | |
575 | ||
576 | /* | |
577 | * Remove all kernel modules in reverse order. | |
578 | */ | |
579 | void modprobe_remove_lttng_all(void) | |
580 | { | |
581 | modprobe_remove_lttng_data(); | |
582 | modprobe_remove_lttng_control(); | |
583 | } | |
584 | ||
e23b81ed JG |
585 | /* |
586 | * Load control kernel module(s). | |
587 | */ | |
588 | int modprobe_lttng_control(void) | |
589 | { | |
adfe4f5e JG |
590 | return modprobe_lttng(kern_modules_control_core, |
591 | ARRAY_SIZE(kern_modules_control_core)); | |
e23b81ed | 592 | } |
ab57d7d3 | 593 | |
c9d42407 PP |
594 | /** |
595 | * Grow global list of probes (double capacity or set it to 1 if | |
596 | * currently 0 and copy existing data). | |
096102bd | 597 | */ |
c9d42407 | 598 | static int grow_probes(void) |
096102bd | 599 | { |
c9d42407 PP |
600 | int i; |
601 | struct kern_modules_param *tmp_probes; | |
fbb9748b | 602 | |
c9d42407 PP |
603 | /* Initialize capacity to 1 if 0. */ |
604 | if (probes_capacity == 0) { | |
605 | probes = zmalloc(sizeof(*probes)); | |
606 | if (!probes) { | |
607 | PERROR("malloc probe list"); | |
608 | return -ENOMEM; | |
609 | } | |
610 | ||
611 | probes_capacity = 1; | |
612 | return 0; | |
fbb9748b JG |
613 | } |
614 | ||
c9d42407 PP |
615 | /* Double size. */ |
616 | probes_capacity *= 2; | |
617 | ||
618 | tmp_probes = zmalloc(sizeof(*tmp_probes) * probes_capacity); | |
619 | if (!tmp_probes) { | |
fbb9748b JG |
620 | PERROR("malloc probe list"); |
621 | return -ENOMEM; | |
622 | } | |
623 | ||
c9d42407 | 624 | for (i = 0; i < nr_probes; ++i) { |
adfe4f5e JG |
625 | /* Ownership of 'name' field is transferred. */ |
626 | tmp_probes[i] = probes[i]; | |
c9d42407 PP |
627 | } |
628 | ||
629 | /* Replace probes with larger copy. */ | |
630 | free(probes); | |
631 | probes = tmp_probes; | |
632 | ||
633 | return 0; | |
634 | } | |
635 | ||
636 | /* | |
637 | * Appends a comma-separated list of probes to the global list | |
638 | * of probes. | |
639 | */ | |
640 | static int append_list_to_probes(const char *list) | |
641 | { | |
642 | char *next; | |
d3c04b7c | 643 | int ret; |
50e0fa5f | 644 | char *tmp_list, *cur_list, *saveptr; |
c9d42407 | 645 | |
a0377dfe | 646 | LTTNG_ASSERT(list); |
c9d42407 | 647 | |
44603c80 | 648 | cur_list = tmp_list = strdup(list); |
c9d42407 PP |
649 | if (!tmp_list) { |
650 | PERROR("strdup temp list"); | |
651 | return -ENOMEM; | |
652 | } | |
653 | ||
654 | for (;;) { | |
fbb9748b | 655 | size_t name_len; |
c9d42407 | 656 | struct kern_modules_param *cur_mod; |
fbb9748b | 657 | |
50e0fa5f | 658 | next = strtok_r(cur_list, ",", &saveptr); |
fbb9748b | 659 | if (!next) { |
c9d42407 | 660 | break; |
fbb9748b | 661 | } |
44603c80 | 662 | cur_list = NULL; |
fbb9748b JG |
663 | |
664 | /* filter leading spaces */ | |
665 | while (*next == ' ') { | |
666 | next++; | |
667 | } | |
668 | ||
c9d42407 PP |
669 | if (probes_capacity <= nr_probes) { |
670 | ret = grow_probes(); | |
671 | if (ret) { | |
398d5459 | 672 | goto error; |
c9d42407 PP |
673 | } |
674 | } | |
675 | ||
fbb9748b JG |
676 | /* Length 13 is "lttng-probe-" + \0 */ |
677 | name_len = strlen(next) + 13; | |
678 | ||
d3c04b7c | 679 | cur_mod = &probes[nr_probes]; |
c9d42407 PP |
680 | cur_mod->name = zmalloc(name_len); |
681 | if (!cur_mod->name) { | |
fbb9748b | 682 | PERROR("malloc probe list"); |
398d5459 MD |
683 | ret = -ENOMEM; |
684 | goto error; | |
fbb9748b JG |
685 | } |
686 | ||
c9d42407 | 687 | ret = snprintf(cur_mod->name, name_len, "lttng-probe-%s", next); |
fbb9748b JG |
688 | if (ret < 0) { |
689 | PERROR("snprintf modprobe name"); | |
398d5459 MD |
690 | ret = -ENOMEM; |
691 | goto error; | |
fbb9748b | 692 | } |
c9d42407 | 693 | |
adfe4f5e JG |
694 | cur_mod->load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL; |
695 | ||
c9d42407 | 696 | nr_probes++; |
fbb9748b JG |
697 | } |
698 | ||
c9d42407 | 699 | free(tmp_list); |
c9d42407 | 700 | return 0; |
398d5459 MD |
701 | |
702 | error: | |
703 | free(tmp_list); | |
704 | free_probes(); | |
705 | return ret; | |
c9d42407 PP |
706 | } |
707 | ||
708 | /* | |
709 | * Load data kernel module(s). | |
710 | */ | |
711 | int modprobe_lttng_data(void) | |
712 | { | |
713 | int ret, i; | |
714 | char *list; | |
715 | ||
716 | /* | |
717 | * Base probes: either from command line option, environment | |
718 | * variable or default list. | |
719 | */ | |
412d7227 | 720 | list = the_config.kmod_probes_list.value; |
c9d42407 PP |
721 | if (list) { |
722 | /* User-specified probes. */ | |
723 | ret = append_list_to_probes(list); | |
c9d42407 PP |
724 | if (ret) { |
725 | return ret; | |
726 | } | |
727 | } else { | |
728 | /* Default probes. */ | |
729 | int def_len = ARRAY_SIZE(kern_modules_probes_default); | |
c9d42407 | 730 | |
62e0422e | 731 | probes = zmalloc(sizeof(*probes) * def_len); |
c9d42407 PP |
732 | if (!probes) { |
733 | PERROR("malloc probe list"); | |
734 | return -ENOMEM; | |
735 | } | |
736 | ||
737 | nr_probes = probes_capacity = def_len; | |
738 | ||
739 | for (i = 0; i < def_len; ++i) { | |
740 | char* name = strdup(kern_modules_probes_default[i].name); | |
741 | ||
742 | if (!name) { | |
743 | PERROR("strdup probe item"); | |
398d5459 MD |
744 | ret = -ENOMEM; |
745 | goto error; | |
c9d42407 PP |
746 | } |
747 | ||
748 | probes[i].name = name; | |
adfe4f5e | 749 | probes[i].load_policy = kern_modules_probes_default[i].load_policy; |
c9d42407 PP |
750 | } |
751 | } | |
752 | ||
753 | /* | |
754 | * Extra modules? Append them to current probes list. | |
755 | */ | |
412d7227 | 756 | list = the_config.kmod_extra_probes_list.value; |
c9d42407 PP |
757 | if (list) { |
758 | ret = append_list_to_probes(list); | |
759 | if (ret) { | |
398d5459 | 760 | goto error; |
c9d42407 PP |
761 | } |
762 | } | |
763 | ||
764 | /* | |
765 | * Load probes modules now. | |
766 | */ | |
adfe4f5e | 767 | ret = modprobe_lttng(probes, nr_probes); |
398d5459 MD |
768 | if (ret) { |
769 | goto error; | |
770 | } | |
771 | return ret; | |
772 | ||
773 | error: | |
774 | free_probes(); | |
775 | return ret; | |
096102bd | 776 | } |